COMPULSORY SWITCHING METHOD IN PABX

摘要

The method for interrupting the call having lower priority by a call having higher priority to connect the urgent call comprises steps: (a) priority granting to the subscriber; (b) receiving hookflash signal and secret number; (c) comparing the priority with two calls; (d) interrupting the call if the call has higher priority than the calling part; and (e) informing the interruption state to the interrupted calling part.